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A374207 as a simple table

na(n)
20
30
40
50
61
70
81
90
101
110
120
130
140
150
160
170
180
190
200
211
222
230
240
250
262
271
281
290
300
310
320
330
340
352
361
370
381
390
400
410
420
430
440
452
460
470
481
490
500
511
520
530
540
550
560
570
581
590
602
610
620
630
641
650
660
670
681
691
700
710
720
730
743
751
760
771
780
790
802
810
820
830
840
852
861
870
880
890
900
911
921
931
940
950
960
970
983
991
1001
1010
1020
1030
1040
1050
1061
1070
1080

[0,0,0,0,1,0,1,0,1,0,0,0,0,0,0,0,0,0,0,1,2,0,0,0,
 2,1,1,0,0,0,0,0,0,2,1,0,1,0,0,0,0,0,0,2,0,0,1,0,0,
 1,0,0,0,0,0,0,1,0,2,0,0,0,1,0,0,0,1,1,0,0,0,0,3,1,
 0,1,0,0,2,0,0,0,0,2,1,0,0,0,0,1,1,1,0,0,0,0,3,1,1,
 0,0,0,0,0,1,0,0]